Furnace.



W. M. DUNCAN.

FURNACE.

APPLICATION men APR. 13. 1914.

V Patented July 6, 1915.

' HMWW W. M. Dmwan 4 his. Jl. l

'WILLIA'M MELLE'N DUHCAET, U1 ALTUN, KLEIN 0155.

FURNACE.

null-Immu- Po'ienced duly 63, 19115.

Application filed April 13, 1397.4. erm N0. BSLMfi.

To aZZ whom it may concern Be it known that L WILLIAM M. DUNCAN, s ciiizeii of the United States of Americe, and resident of Ali/on, in the county of Madison and State of illinois have invented certain new and useful Improvements in Furnaces, of which the following is a full, clear and exact description, reference being lied to the accompanying drawings, forma part of this specification,

My invention relaees to on six regulating device psriziculsrly adapted for use in fur neces provided with traveling chain grates.

The chain crates of mechanical stokers are so constructed that is has heretofore been, found quite diiiicuhb to regulate or control ifne admission of air to the fuel supporting grates, and owing to the lack of proper regulsiting devices, too much air is admitted at some points on the grates While at other points the oil? suppiy insuilicieni. Une oii the most undesirable "features of the old siisuctures than; more air is odmitied into the combustion chambers than is needed for the proper burning of the cool and the gases of combustion. The greatest quantity of sir ususliy enters at the rear end. of the grate Where the grate links are separated from each oizhez' in passing around the supporsing Wheels, and also through the rear portion of 15316 grate where the fuel bed is almost eniairely horned away Under didereni; op ere'rbieg conditions on insuilicient or on exeessive volume of sir may enter the combustion ehenihei' o various diil'crens points, the object of she presenl; invention is she production of an air regulsting device adopted to control the admission of air at various different poims helowthe fuel sup porting In the preferred form of my invention a series of ependently adjustable dampers below the fuel supporting ere err, gasses and these dampers may be adjusted selectively to very she air supply, thereby enabling the operator to secure the loose results by controlling the admission of air shsoughoiil; she fuel hed.

l igsi'e ii is a longitudinal section of a inmsce enihodyin' the features of my inveniion. illi is a transverse section Zllfmig i the upper row of grate hers showing one of the dampers arranged below geese loci-s.

the accompanying drew-lugs; A. des

igneies side from-es provided with Wheels B and arranged hcia'veen furnace Walls (I.

l designates a drive shaft mounted in. the side frames at she front end of the furnace and 2 designates an. idle shaft mounted in side frames at the rear of the furnace. The drive shaft is provided With suitable drive Wheels 3 and the idle shaft is provided with idle Wheels i. The Wheels 3 and 42 support a chain grate D having an upper row of grate bars 5 the bottom feces of which rest on rollers 6 and a lower row gmie bars 7 ressing; upon rollers 8. The rollers are mounted on. rods 9 secured to the side from s A.

A series of damper shops l0 supportedby the side frames A is arranged below the rollers 6, each of "these damper stops being provided with flanges iii. and 12 adopted to engage damper plcbxs The damper '75 plates are secured to damper shafts 14 icon nsled. in see side frames and provided with non-circular: ends 15 adapted to receive a damper operating device 16, The damper opera/ting device I have shown is a socket so Wrench adapted to pass through openings 17 in one of izho furnace Wells C, said openings losing located direccly opposite to the damper shafts 142. i l. closure plate 18 is preferably secured to a cross beam 18 at, the rear of the grate to prevent or control the escape of air at this point, The row of dampers 13 extends substantially from end to of she grabs, end any oi? these he 120 control izhe ol below the upper stow giete have 5 damper stops 1U, together with roll form the side wells of ssvzziae sir inle s segevvsys 19 through WE; bottom of she iippcr cos c hers, and since she rollers co said bottom i sce ihe enrieri said pzsssgeways cannot escape into [i I the other passageways, nor can. from one of the passageways i; she feces of the grate hers shove air-old e!- pas sagews v. The dampers 'preffereh direct connection with the c Lu end said. chain free to travel ind 0 identi y oi the dumps The dampers i: a}; be ad: justed indepei ily oi each other and they roov he maintained in different positions to she civeiy control the admission 0? oil to she viii-ions inlet passages-mi s 1%. "lhc chain grate preferably surrounds the row of no dampers as shown in Fig. Land the closure plate 18 is preferably located adjacent to the damper at the rear end of row to prevent the escape of a large volume of air at the rear of the dampers.

I claim 1. In a furnace, a traveling chain grate structure comprising a lowerrow of grate bars and an upper row of grate bars adapted to support the fuel, side frames supporting said chain grate structure, a series of partition members extending doWt Wardly from the bottom face of said uppe1 row of grate bars to provide a series of separate inlet passage- Ways, said partition nembers including rollers extending across the grate structure, said upper 'row of grate bars being seated upon said rollers to prevent the escape of air from one of the passageways to the bottom faces of the grate bars at the upper end of another of the passageways, a series of dampers extending across the grate structure between said upper and lower rows of grate bars, each of said dampers being adapted to regulate the admission of air to one of said separate passageways, and means for adjusting said dampers independently of each other to positively regulate the admission of air at different points on the bottom face of said upper row of grate bars.

20 In a furnace, a traveling chain grate structure comprising a lower row of grate bars and an upper ro of grate bars l'apted to support the fuel, side frames supporting said chain grate structure, a series of partition members extending downwardly from the bottom face of said upper row of grate bars to provide a series of separate inlet passageways, said partition incn'ibez-s including damper stops extending across the grate structure and rollers extending across the grate structure, said upper row of grate bars being seated upon said rollers to prevent the escape of airfroni one of the passageways to the bottom faces of the grate bars 

